I find this topic fascinating.
For me, the paradigm is romanticism. It is true that previously there was a lot of "love" music, but in baroque and classicism the mechanisms were different, although many would evolve to romanticism.
For example, I think it expresses that idea:
That there is a stable accompaniment pattern (arpeggios).
That the melody is clear, at least in a first exposure. And that the intervals with respect to the left hand are consonant.
Ascending melody (longing) and descending melody (relaxation).
Polyrhythmic contrast, usually 2 against 3 or 4 against 3, see measure 6.
Syncopasions in melody (measures 10, 11...) over the constant rhythm.
Some plagal cadences, even using IV minor (measures 14 to 16).
Subtle harmonic changes, e.g. beginning of the exposition with Gm instead of Bb in measure 17.
Counter melodies in "echo", measures 17, 18...
Union of voices and dissociation, measure 19.
Modulations to unrelated keys as in measure 25 to G#m.
Progressive complication as in these measures 25 onwards.
Subtle harmonic changes, use of diminished and semi-diminished, progressions by thirds (see final).
Final resolution towards the calm.
A different matter is what someone (me in this case) wants to express. Anyway, without going too deeply into intimacy..., there are an infinite number of possibilities to express in "love". But I can say that, these days I am invaded by a set of feelings not only towards someone, but what this is provoking in me in general. For example, having been accustomed to a chosen life of solitude that now I "almost" can't stand.
It is complicated to express anything in music and I think that what you can do is to leave in the notes certain emotions or diffuse or general sensations.
Anyway, I wanted to contribute this, also because no one has encouraged....
Greetings.